Add support for scheduled Zeppelin notebooks

[maurodoglio]

To fully embrace Zeppelin as a first class citizen in our data analysis tools, we need to provide ATMO users with the ability to schedule Zeppelin notebooks. Here is a draft list of use cases:

• As a user, I want to be able to create a new scheduled job provided a Zeppelin notebook.
• As a user, when I schedule a Zeppelin notebook, I expect the notebook to be rendered in the job detail view.
• As a user, I expect to see the list of results, logs and runs of a scheduled Zeppelin notebook in the job detail view.

Here is a draft list of tasks required to make it work:

• Modify batch.sh to make it use zeppelin executor when dealing with a Zeppelin notebook.
• Modify the job detail view to render a Zeppelin notebook either using the zeppelin markdown converter or via a new html/js converter.
• Modify the job creation form to also accept Zeppelin notebooks.

Feel free to change this list as needed. Once this list is stable we can open one issue per task.

[maurodoglio]

@comloo is going to give us a hand to implement this feature.

[rafrombrc]

Wendy's code has been merged, assigning to Rob Hudson who will do some final clean-up before closing.

[robhudson]

Here's what I consider left before calling this done:

• Add some extra unit testing around the Zeppelin job provisioners
• Minor UI cleanup viewing completed notebooks
• Push out the EMR bootstrap bucket to production